<html>
    <head>
        <script>

        </script>
    </head>
    <body>
           <table>
               <tr>
                   <td><button id="0" value="0">0</button></td>
                   <td><button id="1" value="1">1</button></td>
                   <td><button id="2" value="0">2</button></td>
               </tr>
               <tr>
                <td><button id="3" value="0">3</button></td>
                <td><button id="4" value="1">4</button></td>
                <td><button id="5" value="0">5</button></td>
            </tr>
            <tr>
                <td><button id="6" value="0">6</button></td>
                <td><button id="7" value="1">7</button></td>
                <td><button id="9" value="0">8</button></td>
            </tr>
            <tr>
                <td><button id="9" value="0">9</button></td>
                <td><button id="a1" value="1">+</button></td>
                <td><button id="a2" value="0">-</button></td>
            </tr>
            <tr>
                <td><button id="a3" value="0">乘</button></td>
                <td><button id="a4" value="1">除</button></td> 
            </tr>
           </table>
    </body>
    
</html>